The Atom
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Nucleus
This is a group of protons and neutrons in the center of all atoms.
Electron
This is a subatomic particle with a negative charge and very little mass.
Proton
This is a subatomic particle with a positive charge and a mass of 1 amu.
Neutron
This is a subatomic particle with no charge and a mass of 1 amu.
Ion
This is an atom that has lost or gained electrons.
Atom
This is the basic building block of all matter.
Isotopes
Atoms of the same element with varying number of neutrons.